cam: options: Support parent-child relationship between options

Add support for creating a tree-based hieararchy of options instead of a
flat list. This is useful to support options that need to be interpreted
in the context of a particular occurrence of an array option.

The usage text automatically documents the options in their
corresponding context:

Options:
  -c, --camera camera ...                               Specify which camera to operate on, by id or by index
  -h, --help                                            Display this help message
  -I, --info                                            Display information about stream(s)
  -l, --list                                            List all cameras
      --list-controls                                   List cameras controls
  -p, --list-properties                                 List cameras properties
  -m, --monitor                                         Monitor for hotplug and unplug camera events

Options valid in the context of --camera:
  -C, --capture[=count]                                 Capture until interrupted by user or until <count> frames captured
  -F, --file[=filename]                                 Write captured frames to disk
                                                        If the file name ends with a '/', it sets the directory in which
                                                        to write files, using the default file name. Otherwise it sets the
                                                        full file path and name. The first '#' character in the file name
                                                        is expanded to the camera index, stream name and frame sequence number.
                                                        The default file name is 'frame-#.bin'.
  -s, --stream key=value[,key=value,...] ...            Set configuration of a camera stream
          height=integer                                Height in pixels
          pixelformat=string                            Pixel format name
          role=string                                   Role for the stream (viewfinder, video, still, raw)
          width=integer                                 Width in pixels
      --strict-formats                                  Do not allow requested stream format(s) to be adjusted
      --metadata                                        Print the metadata for completed requests

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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